Boring device



E. E. DAVIS BORING DEVICE 2 Sheet s-Shq'gt 1 Filed May 5 .1923

JJIIL //7vE/-/T0R DAW5 5V @J 1. ATTORNEYS Jan. 8, 1929.

Jan. 8, 1929. 1,698,394

E. E. DAVIS BORING DEVICE Filed May 31, 1923 2 Sheets-Sheet 2 Patented Jan. 8, 1929.

UNITED STATES 1,698,394 PATENT FFIcE. I

EMERY E. DAVIS, OF ST. LoUIS, MISSOURI, ASSIGNOR TO DAVIS BORING rOOLcOM- PANY, on ST. LoUIs, MISSOURI, A CORPORATION OF.MISSOURI.

' BORING Application filed May 31,

This invention relates to improvements in boring devices, and particularly to a simple boring device which may be used in finishing and reboring the cylinder bores of internal combustion engines. As is well known, it is often necessary after an internal combustion engine has been in use for some time'to rebore the cylinder bores thereof, and

heretoforeit has been necessary for the me-v 1c chanic performing this work to. be provided with expensive and comparatively oomphcated equipment. The device disclosed In the present application is inexpensive to produce which come within the scope of the claims hereunto appended. v

Fig. I is a side elevation of my Improved boring device, showing same arranged above a cylinder bore of an internal combustlon engine.

Fig. II is an enlarged fragmentarysection of the portion of the device through which the threaded tool-carrying shaft passes.

Fig. III is a section on line IIIIII of Fig. I.

Fig. IV is a side elevation of the device, showing the device after the cutting member thereof has passed through the cylinder bore. Fig. V is a section on line VV of Fig. I. In the drawings, A designates a fragment of an internal combustion engine and B one of the cylinder bores thereof. My improved boring device C is supported by the internal combustion engine in a position immediately above a cylinder bore B, the cylinder head of said internal combustion engine being removed so that the cutting tool of said boring device may be moved downwardly into said cylinder bore. The body of the internal combustion engine is provided with threaded openings D which receive the fastening devices by which the cylinder head is secured to said engine body, and these threaded open- DEVICE.

1922. Serial No. 642,614.

ings are utilized to'receive the fastening 'de vices by which the boring device C is secured to the engine. The boring device C comprises a base plate 1 which preferably comprises a semicircular member provided with a' plu-v rality ofoutwardly extending ears, each of which is provided with an opening 2. Ar ranged below the base plate 1 is a plurality of curved arms2, each of said arms 2- being provided with a slot 2 extending longitudinally of said arm, and each of said arms bemg secured to the base plate by means of a bolt 2" which passes throughan aperturei-n said arm and through the associated opening 2 in the base plate 1. To secure the boring device to the body of the internal combustion engine, the arms 2 are arranged so that portions of the slots 2 register with the openings D in the body of engine A, and suitable bolts are then passed through said slots 2 and screwed into the threaded openings D in the engine body, whereby said boring device is firmly clamped in place on said engine body. Extending upwardly fromthe base plate 1 is a plurality of arms 3 preferably formed integral with said baseplate. Located atthe upper ends of the arms 3,-and' preferably formed integral therewith, is an elongated clamping head 4, Said head being provided with a slit 5 which extends downwardly from the top edge of said head 4.

A pair of ears 6 are formed on the head 4, one of said ears being formed at each side of the slit 5 at the upper end thereof. The cars 6 are each provided withan opening, there being av smooth opening? in one of said ears and a threaded opening 8 in the other of said ears. 4 9 designates a'bolt provided with an enlarged head portion, said bolt being adapted to be passed through the smooth opening 7 and screwed into the threaded opening 8, the enlarged head portion of said bolt being adapted to bear. against the Outside face of one of the ears, whereby saidears are drawn together when the bolt is rotated in one direction and permitted to move apart when. said bolt is rotated in the opposite direction. 7

Located within the head 4 is a sleeve 10, said sleeve being clamped in place by the bolt 9 which draws the ears 6 together and causes the diameter of the split head 4 to be reduced, whereby said sleeve 10 is tightly gripped within the head 4. The sleeve 10 is provided with an annular flange at its upper end, which is adapted to bear against-the upper face'of the bearing 4, and said sleeve is internally threaded, as indicated at 11, tor apurpose to beherei-nafter set forth-L Extending downwardly'through the sleeve 10 is l a shaft 12 provided with threads 13,, said shaft being provided at'its upper endwith an operating memberl l and at its lower end with a cuttingtool 1 5. 10

The operationof my device is as follows: Assume: that the boring device has been properly located above the cylinder bore to be rebored. The threaded shaft 12 is rotated by A means ofthe member 14,'and due tothe fact that the threads 13 on the shaft 12 engage thethreads 11 in the sleeve, said rod will move vertically relative to said stationary sleeve,

consequently rotationof said rod in the neously' rotated and moved axially through the bore B, and as the cutting members 15,, i

of said reamer are in contact with the wall of said bore,thesurfiace thereof will be removed. After thecutting tool reaches the position in. which it is shownin Fig. V of the; drawing, the boring operation has been completed, and it is then desired to withdraw,

the cutting tool- .tromthe bore B. If it were necessary to withdrawthe cutting tool from thebore by reversing the direction of rotai tion of the threaded shaft 12, much time would be consumed, but the loss of time is avoided in'the device disclosed in the present application i nthe, use of which it is only a necessary to unscrew the bolt 9, thus permitting the head 41 to expand,thereby releasing the frictional grip between the inside face of saidhead and the outside face ofsaid sleeve.

1 The operating handles may then" be grasped and as the frictional grip" between the. head 4 andthesleeve has been. released, said shaft,

sleeve and cutting, tool may be drawn upwardly until said cuttingtoolhas been removed from the engine bore. 7

By the use of the curved arms-2 it is'appan ent that the device may be used to rebore the cylinder bores of engines of various sizes, it

only being necessary tonnscrew the nuts on the bolts 2* to permit said arms 2 to be swung pivotally relative to thebase plate 1, so thatportions of the slotsof said arms may be brought into registration with the threaded openings D in thefenginebody.

This arrangement is necessary because, as is known, the threaded openings D are in dif-.

ferentrelative positions on engines of differentsizes. It is, of course, also plain that out ting toolsof different? sizes will have to be used for c ylind'erbores ofdifferent diameters,

and the cutting members used in connection with my device will be attachedtofand dc tached'fromthe lowerend of the shaft the usual manner. 'I'clann;

A borm device comprising acutting tool,

a threads shaft to which said cutting tool, is attached, means comprising a non-eX- p ansible internally threaded member. through which said threaded shaft passes, an. ex-

pansible and contrac'tible head within which i said internallythreaded member is located, a

said non-expansible internally threaded member being rovided with a flange which contacts witht 1e top face of said expansible and :contractiblehead" to limit the downward, movement of said internally threaded mem her, said expansible. and contractible head being adapted to'grip said internally thr ad t ed member to hold same immovable, and means whereby said head is permitted to ex pand whereby, saidinternally threaded mem ber maybe moved relative to said head.

In testimony, that I claim the foregoing I hereunto afiix my signature. 1 a

qEMER nDAvIs. l-- a 

